Zieg, I found no difference between the Two when I was setting up my 700. I had the carb from my '74 Olds engine & one from a 700 equipped mid 80's Implala. My original plan was to change baseplates or at least the arm on the shaft, but found the length, placement, ect. to be identical. I did find one that wasn't the same...it was an old carb (early '70's) & had a pin with a hole for a cotter pin & the placement was not the same. Lorne